Granted Patent
Utility
US 5,872,422 · App. 08/575,485
Carbon fiber-based field emission devices
Inventors:
Xueping Xu, Charles Pershing Beetz, George R. Brandes, Robert W. Boerstler, John Steinbeck
Patented Case
View Patent ↗
Granted: Feb 16, 1999
Filed: Dec 20, 1995
Inventors
Xueping Xu
Charles Pershing Beetz
George R. Brandes
Robert W. Boerstler
John Steinbeck
Assignee (at issue)
ADVANCED TECHNOLOGY & MATERIALS CO., LTD.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.